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          Docker 使用阿里云加速镜像服务
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              <time title="创建时间：2016-07-05 14:20:34" itemprop="dateCreated datePublished" datetime="2016-07-05T14:20:34+08:00">2016-07-05</time>
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        <p>使用Docker默认的仓库在国内是相当的慢，还好阿里云提供了镜像服务（当然还有别家）<br>在CentOS7 + Docker1.10的环境下按照阿里提供的帮助文档怎么也不好用，体验不到加速度的感觉.</p>
<span id="more"></span>
<p>centos7 下是用 systemd来管理docker进程的，那看一下docker.service的内容</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">[root@localhost docker]# cat /etc/systemd/system/docker.service </span><br><span class="line">[Unit]</span><br><span class="line">Description=Docker Application Container Engine</span><br><span class="line">Documentation=http://docs.docker.com</span><br><span class="line">After=network.target</span><br><span class="line">Wants=docker-storage-setup.service</span><br><span class="line"></span><br><span class="line">[Service]</span><br><span class="line">Type=notify</span><br><span class="line">NotifyAccess=all</span><br><span class="line">EnvironmentFile=-/etc/sysconfig/docker</span><br><span class="line">EnvironmentFile=-/etc/sysconfig/docker-storage</span><br><span class="line">EnvironmentFile=-/etc/sysconfig/docker-network</span><br><span class="line">Environment=GOTRACEBACK=crash</span><br><span class="line">ExecStart=/bin/sh -c &#x27;/usr/bin/docker-current daemon \</span><br><span class="line">          --exec-opt native.cgroupdriver=systemd \</span><br><span class="line">          $OPTIONS \</span><br><span class="line">          $DOCKER_STORAGE_OPTIONS \</span><br><span class="line">          $DOCKER_NETWORK_OPTIONS \</span><br><span class="line">          $ADD_REGISTRY \</span><br><span class="line">          $BLOCK_REGISTRY \</span><br><span class="line">          $INSECURE_REGISTRY \</span><br><span class="line">          2&gt;&amp;1 | /usr/bin/forward-journald -tag docker&#x27;</span><br><span class="line">LimitNOFILE=1048576</span><br><span class="line">LimitNPROC=1048576</span><br><span class="line">LimitCORE=infinity</span><br><span class="line">TimeoutStartSec=0</span><br><span class="line">MountFlags=slave</span><br><span class="line">Restart=on-abnormal</span><br><span class="line">StandardOutput=null</span><br><span class="line">StandardError=null</span><br><span class="line"></span><br><span class="line">[Install]</span><br><span class="line">WantedBy=multi-user.target</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>可以看到环境变量是在/etc/sysconfig/docker，/etc/sysconfig/docker-storage，/etc/sysconfig/docker-network内。在/etc/sysconfig/docker内有一个ADD_REGISTRY配置项，是被注掉的，把注释去掉，改成下面内容</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ADD_REGISTRY=&#x27;--add-registry 0bzi0oqj.mirror.aliyuncs.com&#x27;</span><br></pre></td></tr></table></figure>
<p>然后执行</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">systemctl daemon-reload</span><br><span class="line">systemctl restart docker</span><br></pre></td></tr></table></figure>
<p>再pull一个镜像试试，是不是快很多呢？</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">[root@localhost home]# docker pull sonatype/nexus</span><br><span class="line">Using default tag: latest</span><br><span class="line">Trying to pull repository 0bzi0oqj.mirror.aliyuncs.com/sonatype/nexus ... </span><br><span class="line">latest: Pulling from 0bzi0oqj.mirror.aliyuncs.com/sonatype/nexus</span><br><span class="line">a3ed95caeb02: Pull complete </span><br><span class="line">5989106db7fb: Pull complete </span><br><span class="line">ac7d6c290ee0: Pull complete </span><br><span class="line">73011fd28201: Pull complete </span><br><span class="line">14bf1cb804f4: Pull complete </span><br><span class="line">7138b67bf6c5: Pull complete </span><br><span class="line">Digest: sha256:29e2af8c2f8af0a557d7feeef6675a9c9305ed935bd5aca8a207b9f642659e1a</span><br><span class="line">Status: Downloaded newer image for 0bzi0oqj.mirror.aliyuncs.com/sonatype/nexus:latest</span><br></pre></td></tr></table></figure>
<p>如果有Trying to pull repository 0bzi0oqj.mirror.aliyuncs.com/sonatype/nexus这个提示就证明你已经享受加速服务了！</p>

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